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Power Allocation Based on SINR Balancing for NOMA Systems with Imperfect Channel Estimation

Wang, Chin-Liang, Wang, Yu-Ching and Xiao, Pei (2019) Power Allocation Based on SINR Balancing for NOMA Systems with Imperfect Channel Estimation In: 13th International Conference on Signal Processing and Communication Systems (ICSPCS 2019), 16-18 Dec 2019, Surfers Paradise, Australia.

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Abstract

This paper investigates power allocation for a downlink non-orthogonal multiple access (NOMA) system with a base station and two users under imperfect channel estimation, where the variance of the channel estimation error for each transmission link is assumed to be known. We first present approximated user capacity expressions according to the error variance information, and then formulate a power allocation optimization problem between the two users for maximizing the minimum approximated user capacity under a total power constraint. Since such a max-min problem is equivalent to maximizing the minimum approximated received signal-to-interference-plusnoise ratio (SINR), a closed-form power allocation solution can be derived based on SINR balancing between the two users. The proposed method involves solving a quadratic equation, and only low implementation complexity is required for practical applications. Computer simulation results show that the proposed max-min power allocation scheme is more robust against channel estimation errors and achieves better worst bit-error-rate performance for the two users, as compared with the conventional fixed power allocation approach and the related max-min method derived according to perfect channel state information.

Item Type: Conference or Workshop Item (Conference Paper)
Divisions : Faculty of Engineering and Physical Sciences > Electronic Engineering
Authors :
NameEmailORCID
Wang, Chin-Liang
Wang, Yu-Ching
Xiao, PeiP.Xiao@surrey.ac.uk
Date : 2019
Funders : Royal Society
Copyright Disclaimer : © 2019 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Uncontrolled Keywords : Capacity; Imperfect channel estimation; Nonorthogonal multiple access (NOMA); Power allocation; Signal-to-interference-plus-noise ratio (SINR)
Related URLs :
Depositing User : Clive Harris
Date Deposited : 27 Sep 2019 12:00
Last Modified : 16 Dec 2019 02:08
URI: http://epubs.surrey.ac.uk/id/eprint/852826

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